Related Mcqs:

1. The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?

   A. 10
   B. 20
   C. 25
   D. 30

2. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?

   A. √μ
   B. 1/√μ
   C. 1/μ
   D. 1/μ2

3. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?

   A. Added to the feed slurry
   B. Pre-coated on the filter medium prior to filtration
   C. Separated from the cake by dissolving solids or by burning it off
   D. All A, B. & C.

4. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant ______________ filtration?

   A. Rate
   B. Pressure
   C. Both A. & B.
   D. Neither A. nor B.

5. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?

   A. Compressible cakes and laminar
   B. Incompressible cake and laminar
   C. Compressible cake and turbulent
   D. Incompressible cake and turbulent

6. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ___________________?

   A. ½w2 . R2 . ρL
   B. ½w2 . δ2 . ρL
   C. ½w2 . δρL (2R + δ)
   D. ½w2 . R . ρL(R + 2δ)

7. The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__________________?

   A. ∝ ΔP
   B. ∝ 1/ ΔP
   C. ∝ √ΔP
   D. Independent of ΔP

8. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________?

   A. Increases
   B. Decreases
   C. Remains constant
   D. Increases linearly

9. Flow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?

   A. Kozeny-Carman
   B. Hagen-Poiseuille’s
   C. Fanning’s
   D. Kremser

10. In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?

    A. Plug
    B. Turbulent
    C. Laminar
    D. None of these